Abstract
The concept for the use of vision-based tracking is that precise knowledge of the motions of many material points on the surface of interest can be obtained and used to discriminate between different types of landslides and patterns of behavior. Fiducial-based photogrammetry is inexpensive and robust, requires onetime placement of markers, and allows the user to determine temporal and spatial acquisition of digital images of marked slopes over extended time. Motions determined from analyses of serial images of day (boards and spheres) and night (LEDs) visible markers can be expressed in terms of displacement per day or weekly variation in the daily rate or in terms of total, vertical, downslope, or across-slope velocity, all depending on the needs of the user. By quantifying motion, the underlying processes driving a landslide can be understood, allowing appropriate mitigation or management strategies to be designed. Using markers that can be seen by the naked eye day and night provides communities in landslide-prone areas with a simple method to detect change in a pattern of markers on a slope.
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